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Old 05-17-2007, 07:17 PM
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Default Yamaha dirt bikes

We are now the proud owners of 3 non-working 70's era dirt bikes - 2 DT125s and a DT175.
Thought after working on a cruiser, these things would be easy - NOT!!
Anybody out there with any experience on these guys?
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Old 05-17-2007, 07:38 PM
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I've been known to play with a 2 stroke once or twice...

not that particular one, but they are real simple, yet subtly complex
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Old 05-17-2007, 07:42 PM
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Interested in helping a noob learn?
Quote:
Originally Posted by green machine View Post
I've been known to play with a 2 stroke once or twice...

not that particular one, but they are real simple, yet subtly complex
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1997 Honda civic DX( all stock DD)
1972 Toyota FJ40(4" lift, FJ60 axles, FJ60 4speed with split case, 35's, Detroit locker rear, Lockright front, Marlin Highsteer, 105"WB, Saginaw with GM tilt column, soon to have: 30spline longfields, inners/outters, toybox.
1967 Porsche 912(100% stock)


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Old 05-17-2007, 08:48 PM
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Cool, Vintage Japanese is in your system full-on now!

I collect and restore 60's and 70's era Honda Street bikes. No experience with the 2 strokes though. I have some good connections for vintage japanese mc parts which might help you out.

Oh yeah:

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Old 05-17-2007, 09:43 PM
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<flashback>
Gosh, I remember having an old Yamaha 125cc Enduro back in my college days. It was a serious beast. I remember taking it apart in my frat's basement and getting harassed by the Fire Marshal. I finally managed to sell it and replaced it with a Yamaha RD400. Now, that was a fast two-stroke, it was a replacement for the RD350. You would leave a stop sign on a wheelie without intending to. I was putting so many highway miles on it that I finally replaced that bike with a Yamaha 850 with direct drive.

A conspiracy then developed by the women in my life to separate me from my motorcycles. So ended an era.
</flashback>

I probably don't remember enough to help you out. If I remember correctly, servicing a two stroke isn't too difficult. The first thing I would do is clean everything. Plugs foul quickly on a two stroke and on certain bikes, that have magnetos, you would need to clean the points.

Second thing I would do is get a service manual for each of them. The DT125 was very popular, it shouldn't be too hard to find manuals. Have fun.

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Old 05-17-2007, 10:14 PM
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Nice pick up, I used to ride the 175, most likely the start of my back problems

Never really tore into it to much back then, bought it running and sold it running so no real wrenching, sorry I could not be more help.

Enjoy your new money-pit..............
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Old 05-17-2007, 10:34 PM
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don't know about the dt.

had an it175e for years. no lo end for a dirt bike, but the price was right. traded it for a bar.270 with a leupold scope.
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Old 05-18-2007, 08:48 AM
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I have messed with ring dings for years. Used to work for Vickery Yamaha in the 70s. Currently I have a KDX220, just freshened the top end. The rest of my garage's residents (some owned by my kids and wife) are thumpers: Honda XR650R, Yammie TTR250, Honda CRF230F, BMW R100LS, and of course a Buell Ulysses.

Whatcha need? Note: most likely you need to thoroughly clean the carbs and perhaps even replace the jets (especially the pilot) due to corrosion by now.
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Old 05-18-2007, 10:54 AM
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also the reeds.. boysen is a good brand.
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Old 05-18-2007, 11:06 AM
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Thanks for all the replies - we do have a manual for both the 125 and 175 - what we really need is some basic learning on what does what and a brief look over of the current condition of the bikes to see what parts and work might be necessary. We need a kick start.....hahaha
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1997 Honda civic DX( all stock DD)
1972 Toyota FJ40(4" lift, FJ60 axles, FJ60 4speed with split case, 35's, Detroit locker rear, Lockright front, Marlin Highsteer, 105"WB, Saginaw with GM tilt column, soon to have: 30spline longfields, inners/outters, toybox.
1967 Porsche 912(100% stock)


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